(2m+n)^2(2m-n)^2[(2m+n)^2][(2m-n)^2]

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(2m+n)^2(2m-n)^2[(2m+n)^2][(2m-n)^2]
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(2m+n)^2(2m-n)^2[(2m+n)^2][(2m-n)^2]
(2m+n)^2(2m-n)^2
[(2m+n)^2][(2m-n)^2]

(2m+n)^2(2m-n)^2[(2m+n)^2][(2m-n)^2]
(2m+n)^2(2m-n)^2
=[(2m+n)(2m-n)]^2
=(4m²-n²)²
=16m⁴-8m²n²+n⁴

[(2m+n)^2][(2m-n)^2]
=[(2m+n)(2m-n)]^2
=(4m^2-n^2)^2
=16m^4-8m^2n^2+n^4